XML 68 R53.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | $ 911,818 |  | $ 1,083,965
Other assets |  | 146,194 |  | 161,932
Other liabilities |  | 95,856 |  | 97,707
Debt, net |  | 641,351 |  | 766,420
Equity | [1] | 320,805 |  | 381,770
DRA Austin Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 259,282 |  | 263,557
Other assets |  | 37,584 |  | 42,272
Other liabilities |  | 17,734 |  | 24,131
Debt, net |  | 247,004 |  | 248,700
Equity | [1] | 32,128 |  | 32,998
BDN - Al Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 158,483 |  | 158,960
Other assets |  | 24,444 |  | 24,181
Other liabilities |  | 4,519 |  | 4,493
Debt, net |  | 92,707 |  | 92,917
Equity | [1] | 85,701 |  | 85,731
HSRE-BDN I, LLC (evo at Cira Centre South) [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 0 | [2] | 143,990
Other assets |  | 0 | [2] | 8,563
Other liabilities |  | 0 | [2] | 1,648
Debt, net |  | 0 | [2] | 110,136
Equity | [1] | 0 | [2] | 40,769
Other Income [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 494,053 |  | 517,458
Other assets |  | 84,166 |  | 86,916
Other liabilities |  | 73,603 |  | 67,435
Debt, net |  | 301,640 |  | 314,667
Equity | [1] | $ 202,976 |  | $ 222,272
[1] | This amount includes the effect of the basis difference between the Company's historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.
[2] | On January 10, 2018, HSRE-BDN I, LLC (evo at Cira Centre South) sold the 345-unit student housing tower, its sole operating asset. See ‘evo at Cira Disposition’ section below.

X
- Definition Equity method investment summarized financial information debt net. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationDebtNet
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Equity Method Investment Summarized Financial Information Net Property. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationNetProperty
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Equity Method Investment Summarized Financial Information Other Assets. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Equity Method Investment Summarized Financial Information Other Liabilities. + References No definition available. + Details
Name: | bdn_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Namespace Prefix: | bdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of equity, excluding noncontrolling interest, attributable to the equity method investment of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33912-111571 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bdn_DRAAustinVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_BrandywineAlVentureLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_HSREBDNILLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bdn_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |